Should I go with an Asus or an Alienware laptop for gaming?

Q: g’day i am looking to upgrade my laptop to new a new gaming one. But seeing though that there is so many to choose from now, i would like a little bit of help (as i am computer illiterate LOL)

i am currently looking at the Alienware 17mx, the asus G75, the msi GE70/GT70 and also a new brand on the market the Venom blackbook 17 B0218.

Now i do understand u get what you pay for, but that is where i am getting a little bit lost, i like the alienware because of the look and how u can customize it…
the asus because that is what i am currently on, even though it is 4 years old she is still going on strong,
the msi, just because to me that is the cheaper option but would that get me through the long run?
And now this Venom brand, i don’t know much about it, and i think that’s what i am afraid of.

Also i would be buying 2, as my girlfriend has just found her knack for online gaming and would like to join me haha!!